Indicating device for radio receiving apparatus



Jan. 15, 1929.

L. L. DRIGGS. JR

INDIGATING DEVICE FOR RADIO nacsxvmg APPARATUS Original Filed Feb. 26, 1925 Elnvaufoz Lam's L .flnyysfli'.

@ I M attomeq' $.4 a/Zw? Patented Jan. 15, 1929.

UNITED STATES PATENT OFFICE.

LOUIS L. BRIGGS, JR., OF NEW ROCHELLE, NEW YORK.

INDICATING DEVICE FOR RADIO RECEIVING APPARATUS.

Original application filed February 26, 1925, Serial No. 11 748. Divided and this application filed June 12,

1926. Serial No. 115,499. 1 r

ing the cover detachably on means carried with the panel board.

Indicating dials mounted on the pane i board of a receiving apparatus, are connected to the condenser and the variable inductance in such a manner that one may tune in for a desired wave length. These indicating dials have heretofore been marked only with numbers whichhave no particular significance, so that when one first sets up his re ceiving apparatus, it is necessary for him to hunt patiently for the signals from various broadcasting stations and to note-in a book the numbers on the dials which correspond with any given station with which his device is in tune. When he wishes to listen in on a given station, he must refer to his notebook and then set the dial in accordance with the numbers therein found. If he loses the notebook or if it is not readily available, then of course, his labor will have been lost and he cannot find any given station with out going through the same experimental work of hunting for the correct setting.

It is accordingly the prime object. of my invention to provide an indicating dial on which the operator may make suitable markings to indicate the different stations as he finds them, so that he may turn the dial di rectly to any given position representing roughly the wave length of a desired station, after which it is merely necessary for him to make a micrometer adjustment to get the exact wave length.

A further object is to improve the construction and design of such an indicating device and to provide a simple form which may be cheaply manufactured and assembled, which permits ready replacement of the record blanks, and which is generally suitable for indicating the correct position for a variable device in a radio apparatus to tune it as desired.

With these and other objects in view as will be apparent to one skilled in the art, my invention resides in the combination of which is mounted the post 62 of the variable device of the radio apparatus, the parts being fastened together by a set screw 63. The periphery of the rotatable dial is provided with a knurled edge 64 or is otherwise so shaped that one may easily rotate the disc by engaging the finger with the edge thereof.

This rotatable dial carries a record blank 65 thereon which may be made of paper, celluloid or other suitable material, and in this case I prefer to hold the record blank in place by means of a spring 66 fastened at one end to the top of the boss 61. The other end of the spring, which is spread in a conical shape, resiliently presses against the record blank 65 and thus holds it firmly in place.

A cover 68 is located over the indicating dial, and it is provided with a central raised portion 69 which covers the boss on the indicating dial. The periphery of the cover is cut away in one or more places 70, which are so located that one may obtain a finger hold on the dial. These holes 70 through the cover, are preferably arranged opposite each other, as illustrated. The cover is further provided with the windows 72 and 73 which may have bevelled edges as above described and suitable indicating markings 74 for aligning the record indicia.

A further window 7 5 in the upper portion of the dial serves to provide means for Jobserving the evenl spaced and numbered dial markings 76 Wl'llCh are ordinarily made on the outer marginal portion of the record blank.

This cover may be suitably fastened to a panel 77 of the radio apparatus, and in this particular modification I have shown as the fastening means a clip 78 which has up wardly curved spring ends 79 bent inwardly in the form of loops and adapted to engage over projecting lugs 80 on the cover. The spring clip may be suit-ably fastened to the panel as by means of bolts 82.

hat I claim is:

In a radio tuning apparatus having a rotatable shaft for operation of the tuning means, adisk carried on and secured to the shaft, a record blank mounted on the face of the disk, means carried with the disk to hold the blank in place, a stationary cover for the disk and provided with an opening to permit observation of the record blank, said cover being also formed With another opening at its edge for direct engagement of the periphcry of the disk with the operatofis finger whereby the shaft may be rotated through finger rotation of the disk and the indicia may similarly be moved a correspondingly 20 extent.

This specification signed this 28 day of May A. D. 1926.

LOUIS L. DRIGGS, JR. 

